运动会英语作文60字
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运动会英语作文60字
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Today is Thursday,it is a fine day, our A secondary school in this day held the 9th Games. One by one the students are very excited, full of energy to meet the challenges. I believe it yourself, you a...
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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